Towards Rotation-Only Imaging Geometry: Multi-View Pose Estimation

원문 초록

Global structure-from-motion (SfM) commonly refines relative poses on individual image pairs and then estimates global rotations by rotation averaging. Pairwise refinement does not explicitly combine feature-level constraints with multi-view consistency during rotation initialization. We introduce Global Rotations from Aggregated Matches (GRAM), which estimates global rotations directly from initial relative rotations and inlier matches by minimizing edge-wise rotation-only algebraic residuals. GRAM replaces two-view relative-pose optimization and rotation averaging with a single stage. We further extend rotation- only imaging geometry to multiple views and develop Multi-view Optimization with Rotation-only Reprojection Error (MORE) for nonlinear global rotation refinement. Analytical Rotation-guided Translation (ART) derives locally scaled triplet translations from Linear Global Translation (LiGT) constraints and recovers global translations using weighted least squares. Synthetic and real-world experiments demonstrate the accuracy, robustness, and efficiency of the proposed methods.